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From "xing@mac.com" <x...@mac.com>
Subject Re: Loading FS index into RAM index
Date Sat, 09 Jul 2005 07:24:02 GMT
Never mind. I need to read the API more closely. 
RAMDirectory(directory) is built into lucene and already does the trick 
with just one line of code.

xing@mac.com wrote:
> I was reading the Lucene book and came across the part where the author 
> detailed how to write index to ram dir and then flush it to file dir.
> 
> That turned on a light bulb and I want to do bidirectional index 
> loading. Build index in ram, store in file for backup. Then if I have to 
> shutdown the process, I can then ask it to reload the index from file 
> back into ram for searching duties.
> 
> Unforunately my code below which tries to load fs index into ram fails 
> right at "ram_writer.addIndexes(fs_dir);" with io exception. When I 
> check "/tmp/lucene-index/", which contains a proper index,  after the io 
> exception everything was erased and the directory was empty.
> 
> Thanks for any pointers.
> 
> Xing
> 
> 
> try {
>         System.out.println("start");
>         //IndexWriter file_writer = new 
> IndexWriter("/tmp/lucene-index/", new StandardAnalyzer(), true);
>         IndexWriter ram_writer = new IndexWriter(new RAMDirectory(), new 
> StandardAnalyzer(), true);
>         System.out.println("loaded ram_writer");
>        
>         Directory[] fs_dir = new Directory[1];
>        
>         fs_dir[0] = FSDirectory.getDirectory("/tmp/lucene-index/", true);
>         System.out.println("loaded fs_dir");
>        
>         ram_writer.addIndexes(fs_dir);
>         System.out.println("load fs_dir into ram");
>        
>         ram_writer.optimize();
>         System.out.println("optimize ram index");
>        
>         ram_writer.close();
>         //index_writer.close();
>        
>         System.out.println("good");
>         }
>         catch (IOException ex) {
>             System.out.println("io exception");
>            
>         }   
> 
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